Valve loader



E. K. LYNN VALVE LOADER Nov. 16, 1937.

mlll mmlml| h Filed Sept. 16, 1936 l4 l5 l6 I7 22 INVENTOR EWING K. LYNN ATTORNEY Patented Nov. 16, 1937 UNITED STATES PATENT OFFICE VALVELOADER.

Application September 16, 1936, Serial No. 101,011

6 Claims.

This invention relates to a valve .device in which is provided a slidevalve adapted to be reciprocated on a valve seat.

In certain types of valve devices, such as the brake valve device shownin U. S. Patent No.

1,980,334 to Ellis E. Hewitt, a slide valve is employed to control thesupply and release of fluid under pressure to and from a fluid pressureoperated device, such as the engines for opening and closing the vehicledoors. This slide valve is operated by a cam on the shaft of the brakevalve.

The slide valve controls communication between ports in its seat, and assome of these ports are supplied with fluid under pressure, it isnecessary to provide means to prevent the slide valve from being liftedfrom its seat by the fluid acting thereon.

It is desirable also to provide means to yieldingly press the slidevalve against the cam on the shaft of the brake valve so that the slidevalve willfollow the surface of the cam and move to the positiondetermined thereby.

It is an object of this invention to provide means adapted to press aslide valve into engagement with its seat and which will also yieldinglyurge the slide valve to move in one direction upon its seat.

A further object of the invention is to provide a valve device" having aslide valve movable upon a seat and controlling communication betweenports in its seat, a cam for moving said slide valve in one directionupon said'seat, and common means for yieldingly pressing the slide valveagainst its seat and against the face of the said cam.

Another object of the invention is to provide an improved valve'device.

Other objects of the invention and features of novelty will be apparentfrom the following description taken in connection with the accompanyingdrawing, in which Fig. l is a view, largely in section, of a valvedevice embodying my invention,

Fig. 2 is a sectional view taken substantially along the line 2-2 ofFig} 1, and Fig. 3 is a sectional view taken substantially along theline 3-3 of Fig. 2.

Referring to the drawing, the valve device shown therein comprises acasing having a main section I, a bottom section 2, and a cover section3, which when secured together form a chamber 5. The bottom section 2 issecured to the main section I by means of screws 6, one of which isshown, while the cover section 3 i 56- cured to the main section bymeans not shown.

The casing section I has secured thereto selflapping valvemechanism, notshown, which may be of the type shown in the above identified patent toEllis E. Hewitt, and which is operated by 5 a shaft it which extendsthrough an opening in the main casing section I, and has its lower endjournaled in a bore in the bottom section 2. The shaft H! has anoperating handle I2 secured thereon by means of which the shaft may beturned to different positions.

The bottom section 2 has a relatively thick portion I3 formed thereon inwhich is formed a channel having at the bottom'thereof a seat, indicatedat M, in which are formed ports I5, I6 and IT. The port I5 is suppliedwith fluid under pressure from a suitable source, such as a supplyreservoir, while the port I6 is connected to a door engine, and the portI1 is connected to the atmosphere.

A slide valve I8 is mounted in the'channel in the casing section 2 so asto be slidable on the seat I4, and this slide valve has a cavity 20 inthe lower face thereof to establish communication between the ports inthe seat I 4. The slide valve I8 is of such width as to substantiallyfill the channel in the casing section 2 so as to be guided by the wallsof this channel.

One end of the slide valve I8 is reduced in size and projects beyond thethick portion I3 on the casing section 2 and engages one face of a camfollower 22, which has secured thereto guide pins 24 which are slidablein bores in the thick portion I3 of the casing section 2 on oppositesides of the channel in which the slide valve [8 is:

mounted.

The other face of the cam follower 22 is adapt ed to be engaged by a camsegment indicated at 26 formed integral with the shaft I0. A portion ofthe shaft I0 opposite the cam segment 26 is cut away, as is clearlyshownin Figs. 1 and 2 of the drawing, and is of such width as to permitthe cam follower 22 and the reduced end portion of the slide valve I8 tobe moved into this cut away portion of the shaft.

The cover section 3 has a bore therein, indicated at 28, which issubstantially in the plane of the channel in the casing section 2. Theaxis of the bore 28 extends at an angle to the slide valve seat I 4, andis arranged to intersect this slide valve seat intermediate the endsthereof. As is clearly shown in Fig. 1 of the drawing, the portion ofthe bore 28 farthest removed from the cam 26 is farther removed from theplane of the slide valve seat I4 than are the portions of the bore 28adjacent the cam 26.

A stem 30 is provided and it has an enlarged head 32 having roundedfaces thereon slidably positioned in the bore 28. The other end of thestem 3|] extends into a socket 33 in the upper face of the slide valveI8, and has a rounded surface which presses against a rounded concaveface in a wear resisting insert 34 mounted in the socket 33 in the slidevalve I8.

The end of the stem 38 is pressed into engagement with the insert 34 bymeans of a spring 36 which extends between the cover section 3 and aspring seat 38 secured on the stem 36.

The various parts of the apparatus are arranged and proportioned so thatwhen the slide valve I8 is in the position which it assumes whenfollower 32, which is a position in which it is shown in Figs. 1 and 2of the drawing, the socket 33 in the slide valve I8 is located at oneside of the axis of the bore 28, while when the slide valve I8 is in theposition which it assumes when the face of the cam segment 26 is out ofengagement with the cam follower 22, the socket 33 will be located onthe other side of the axis'of the bore 28.

In operation the spring 26 exerts force through the spring seat38 topress the end of the stem 30 against the wear resisting insert 34 in theslide valve I8, thereby exerting force'on the slide valve to press theslide valve against the seat I4 to prevent unseating of the slide valveby fluid under pressure supplied through the port I5, and at the sametime the spring 36 exerts force on the slide valve I8 to move it to theright, as viewed in Figs. 1 and 2 of the drawing, and press against theface of the cam segment 26.

On movement of the operating lever I2 in a direction to move the shaftIII in a clockwise direction, as viewed in'Fig. 2 of the drawing, thecam segment 26 is moved across the face of the cam follower 22, andafter a certain amount of turning of the shaft ID, the cam segment 26will be moved away from the cam follower 22 and will not maintain theslide valve I8 in the position in which it is shown. 7

On this amount of movement of the shaft III, the slide valve I8 is movedto the right by force exerted by the spring 36 through the stem 30,

, while the spring 36 expands somewhat.

than that in which it is shown in the drawing.

The stem 36 is free to change its position as the rounded head portion32 permits it to move freely in the bore 28.

On subsequent movement of the operating handle I2v in a direction toturn the shaft III in a counterclockwise direction, as viewed in Fig. 2of the drawing, and thereby return the cam segment 26 to the position inwhich it is shown in Fig.2

of the drawing, the cam segment 26 presses against the cam follower 22and moves it to the left, as viewed in Fig. 2 of the drawing, and itsmovement is transmitted tothe slide valve I8 to move the slide valve onits seat I4. On this movement of the slide valve I8, the stem 30 ismoved upwardly in the bore 28in the cover section 3, while the spring 36is compressed slightly.

It will be seen that the spring 36 operates both to press the slidevalve I8 against the seat I4, and to press the slide valve I3 againstthe face of the camsegment 26 carried by the shaft Ill.

The division of the force exerted'by the spring 36 on the slide valve I8to press the slide valve against the seat I4, and to press the slidevalve against the cam on the shaft I0 depends upon the angular positionof the stem 30. The stem 30 is arranged so that the force exerted on theslide valve I8 to hold it seated is great enough in all positions of theslide valve to prevent the slide valve from being unseated by the fluidunder N pressure acting thereon. The spring 36 also exthe face of thecam segment26 engagesthe cam" erts enough force on the slide valve I Btending to press it against'the cam on the shaft I0 to insure that thevalve will move upon its seat when the cam .26 is moved away from theslide valve.

While one embodiment in the improved valve device provided by myinvention has been illus trated and described in detail, it should beunderstood that. the invention is not limited to these details ofconstruction, and that numerous changes and modifications may be madewithout departing from the scope of the following claims. j

' Having now (described my invention; what I claim as new and desire tosecure by Letters Patent, is:

1. In a valve device, in combination, a body having a seat thereonhaving ports therein, a slide valve movable upon said seat to controlcommunication through said ports, a cam associated with said slide valvefor moving it in one direction on said seat, and a spring associatedwith said slide valve for yieldingly pressing said slide valve againstsaid seat and for also pressing said slide Valve against said cam.

2. In a valve device, in combination, a body having a seat thereonhaving ports therein, a slide valve movable upon said seat to controlcommunication through said ports, a cam associated with said slide valvefor moving itin one direction on said seat, and a spring associated withsaid slide valve for yieldingly pressing said slide valve against saidseat and for also yieldingly opposing movement of the slide valve bysaid cam.

3. In a valve device; a body having a seat thereon having ports therein,a slide Valve movable upon said seat to control communication throughsaid ports, a cam for moving said'slide valve in one direction on saidseat, a stem pivotally engaging said slide valve and extending away fromsaid valve seat and away from the slide valve in said one direction, anda spring for pressing said stem against said slide valve whereby saidslide valve is yieldingly pressed against said seat and is alsoyieldingly pressed against said cam. I

4. In a valve device, in combination, a body having a seat thereonhaving ports therein, a slide valve reciprocably movable on said seat ina given plane to control communication through said ports, said bodyhaving a bore therein in the plane of 'movement of the slide valve, saidbore extending away from the valve seat in a plane at an angle from thevertical, a stem associated with the slide valve and having an enlargedrounded head slidable in said bore, a spring associated with said stemand pressing said stem Q against said slide valve, and a cam for movingsaid slide valve against said spring.

5. In a valve device, in combination, a body having a seat thereonhaving ports therein, a slide valve reciprocably movable on said seat ina given plane'to control communication through said ports, said bodyhaving a bore therein in the plane of movement of the slide valve, saidbore extending away from the valve seat in a plane at an angle from thevertical, a stem associated with the slide valve and having an enlargedrounded head slidable in said bore, a spring associated with said stemand pressing said stem against said slide valve, and means for movingsaid slide valve against the said spring.

6. In a valve device, in combination, a body having a seat thereonhaving ports therein, a slide valve reciprocably movable on said seat ina given plane to control communication through said ports, said bodyhaving a bore therein, the axis of said bore being substantially in theplane of the valve seat and intersecting the valve seat intermediate theends thereof, a slide valve hav- 7 ing a socket therein, a stem havingan enlarged rounded end thereon slidably mounted in said bore, the otherend of the stem extending into the socket in said slide valve, a springassociated with said stem and operating through said stem to yieldinglyurge the slide valve to a position in which the socket therein islocated on one side of the axis of said bore, and means for moving saidslide valve against said spring to a position in which the socket insaid slide valve is located on the other side of the axis of said bore.

EWING K. LYNN.

